Stock markets in turmoil: political institutions and the impact of elections

Martin Lausegger

Economics and Politics, 2021, vol. 33, issue 1, 172-204

Abstract: This paper explores how elections impact stock markets across diverse political institutions. I argue that electoral and party systems impact the fragmentation, credibility, and predictability of electoral information, influencing levels of uncertainty resolved by elections and leading to distinct stock market reactions. First, elections in majoritarian electoral systems produce larger cumulative abnormal returns (CARs) than elections in proportional representation systems. Second, the weaker institutionalized a party systems is, the larger are the CARs around elections. Third, these two institutional variables interact. Elections in majoritarian (proportional representation) systems with weak (strong) party system institutionalizations will have particularly large (small) CARs. I formally derive these propositions, conduct event studies of the impact of 87 elections on SMs in 21 countries from 1999 to 2016, and analyze four case studies.

Date: 2021
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